Serious question, do other HNers browsers lock up anytime they view webgl demos? I was able to play around with this demo but after closing the tab Firefox went in to panic mode.
2011/05/05's Chrome Canary Build acted strangely. After I tried to view the demo, all areas for WebGL or any kind of plugin were able to be clicked-through (essentially holes in the application). It's fixed in 2011/05/07's (13.0.757.0) though.
It threw an error that my video card (Radeon HD 3450) wasn't supported when I used firefox, but seemed to work fine in chrome. Maybe I need to enable some of the webgl options in about:config.